Moving an animation from 1 rig to another in a separate Blender file
Append the Action data block from the first file into the second file, then set the Action in the Action Editor.  There's no need to copy and paste.  If the rigs really are identical, connecting the appended Action should be all you need.

If location and rotation comes in wrong, I'd check the position of your Armature in Object Mode-- could be that you have values on it in one file or the other.